Nicholas Day
 

Nicholas Day is the author of The Mona Lisa Vanishes, a middle-grade book of narrative nonfiction about the wild, improbable story of how the Mona Lisa was stolen—and how it became the most famous painting in the world. The Mona Lisa Vanishes won the Robert F. Sibert Award and the Boston Globe-Horn Book Award for nonfiction.

His newest work of middle-grade narrative nonfiction, A World Without Summer: A Volcano Erupts, A Creature Awakens, and the Sun Goes Out, illustrated by Yas Imamura, was a Robert F. Sibert honor book, a YALSA Excellence in Nonfiction finalist, and was named one of the Ten Best Children’s Books of 2025 by The New York Times.